Stockholders' Equity (Narrative) (Details)	6 Months Ended	12 Months Ended
	Jun. 30, 2016 USD ($) shares	Dec. 31, 2016 USD ($) vote class $ / shares shares	Dec. 31, 2015 USD ($) $ / shares shares	Dec. 31, 2014 USD ($) $ / shares	Oct. 31, 2016 USD ($)	Jan. 31, 2016 shares	Oct. 31, 2015 USD ($)
Stockholders Equity Note [Line Items]
Convertible preferred stock, shares authorized (in shares) | shares		100,000,000	100,000,000
Convertible preferred stock, par value (in dollars per share) | $ / shares		$ 0.001	$ 0.001
Convertible preferred stock, shares issued (in shares) | shares		0	0
Convertible preferred stock, shares outstanding (in shares) | shares		0	0
Number of authorized classes of stock | class		3
Shares reserved for future issuance (in shares) | shares		26,206,647
Total direct tax benefits from stock-based awards vested or exercised		$ 2,137,000,000	$ 1,544,000,000	$ 1,356,000,000
Cash settled awards		$ 168,000,000	50,000,000	0
Cumulative effect of accounting change			47,000,000
Stock options outstanding (in shares) | shares		3,300,000
Stock options exercisable (in shares) | shares		3,300,000
Cash received from the exercise of stock options		$ 298,000,000	393,000,000	465,000,000
Repurchases of capital stock		3,693,000,000	1,780,000,000
January 2016 Share Repurchase Authorization
Stockholders Equity Note [Line Items]
Additional shares authorized to repurchase (in shares) | shares						514,000
Retained Earnings
Stockholders Equity Note [Line Items]
Cumulative effect of accounting change			(133,000,000)
Repurchases of capital stock		3,437,000,000	1,669,000,000
Retained Earnings | New Accounting Pronouncement, Early Adoption, Effect | Accounting Standards Update 2016-09
Stockholders Equity Note [Line Items]
Cumulative effect of accounting change			(133,000,000)
Altera Corp. v. Commissioner
Stockholders Equity Note [Line Items]
Stock-based compensation expense, related tax benefits		690,000,000	522,000,000
Continuing operations
Stockholders Equity Note [Line Items]
Stock-based compensation expense, related tax benefits		1,465,000,000	1,133,000,000	867,000,000
Discontinued operations
Stockholders Equity Note [Line Items]
Stock-based compensation expense, related tax benefits		$ 0	$ 0	$ 30,000,000
Employee stock options
Stockholders Equity Note [Line Items]
Expiration term of award		10 years
Vesting period		4 years
Unrecognized compensation cost		$ 2,000,000
Restricted Stock Units (RSUs)
Stockholders Equity Note [Line Items]
Vesting period		4 years
Weighted-average grant-date fair value of RSUs granted (in dollars per share) | $ / shares		$ 713.89	$ 546.46	$ 573.71
Fair value of RSUs vested during period		$ 9,000,000,000	$ 6,900,000,000	$ 6,000,000,000
Unrecognized compensation cost		$ 14,600,000,000
Weighted average recognition period for unrecognized stock-based compensation expense		2 years 8 months
Class A Common Stock
Stockholders Equity Note [Line Items]
Votes per share class (in votes) | vote		1
Class B Common Stock
Stockholders Equity Note [Line Items]
Votes per share class (in votes) | vote		10
Class C Capital Stock
Stockholders Equity Note [Line Items]
Votes per share class (in votes) | vote		0
Class C Capital Stock | October 2015 Share Repurchase Program
Stockholders Equity Note [Line Items]
Authorized share repurchase amount							$ 5,099,019,513.59
Repurchases of capital stock (in shares) | shares	5,200,000
Repurchases of capital stock	$ 3,700,000,000
Class C Capital Stock | October 2016 Share Repurchase Program
Stockholders Equity Note [Line Items]
Authorized share repurchase amount					$ 7,019,340,976.83
Repurchases of capital stock (in shares) | shares		0